Bulletin of the American Physical Society
APS New England Section 2018 Fall Meeting
Volume 63, Number 21
Friday–Saturday, November 2–3, 2018; University of Massachusetts Dartmouth, Dartmouth, Massachusetts
Session D02: General Physics |
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Room: CCB Building 247 |
Saturday, November 3, 2018 12:00PM - 12:12PM |
D02.00001: Global warming impact on acoustic propagation along the Maritime Silk Road (MSR) David G G Browning The Maritime Silk Road (MSR) from Suez to China is an equatorial sea route whose acoustic transmission properties are vulnerable to global warming. Perhaps the principal impact will be in the surface ducts created by various monsoons. Changes in low frequency attenuation due to ocean acidification, in sound speed due to water temperature, in surface duct frequency limitation from depth changes due to the total precipitation, and variation in ambient noise and surface scatter due to changes in wind speed/wave height; all can be significant. Adding to the complexity of these multifaceted changes is the fact that they all may have different climatic time scales. This will indeed provide a challenge for our modelling and data collection abilities. |
Saturday, November 3, 2018 12:12PM - 12:24PM |
D02.00002: Existence of Multiple Glass Transitions in Amorphous Sb Doped Ge S Glassy Alloys Dipti Sharma, John MacDonald, Anjani Kumar, Rajendra Shukla In this experimental work, an amorphous alloy of Ge25S75-xSbx (where x = 0% and 5%) was made and tested for its glassy behavior. The amorphous alloy was made under vacuum of 10-5 Torr with 12 hours rocking and then with quenching technique. It was observed that three multiple endothermic peaks were appeared around 70 – 120 oC in x = 0% which then with addition of Sb got flattened and spread more widely with lower enthalpy showing existence of three glassy states in the material. This behavior is explained in terms of local electron density of the system. Keywords: Amorphous alloys, Calorimetry, glasses, alloys, vacuum and quenching. |
Saturday, November 3, 2018 12:24PM - 12:36PM |
D02.00003: A Search For Planets in Binary Systems Ben Placek Recently, a new method of detecting exomoons was proposed, which involves the measurement of transit timing variations (TTV) and transit duration variations (TDV) of the host planet. Mainly, there are predictable patterns in the TTV-TDV diagrams of moon-hosting exoplanets. A larger scale version of a star-planet-moon system is a binary system with a planet in an S-type orbit around the lower-mass star. Here we perform a search of the Kepler eclipsing binaries and retrieve eclipse times and durations, in an effort to find patterns in the TTV-TDV diagrams indicative of an unseen companion. |
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